Four men were killed execution-style when gunmen swooped on their town south of Baghdad early Monday, while a top police chief survived a bomb attack in the Iraqi capital, officials said.
In a pre-dawn attack in the town of Yusufiyah, gunmen wearing military uniforms hauled six men out of their homes and shot them. Four died but two survived with injuries, an interior ministry official said.
The town, 25 kilometres (15 miles) south of Baghdad, is located in a Sunni-dominated region that was an Al-Qaeda stronghold until 2008, when local militiamen rose up against the insurgents.
Another interior ministry official said all the victims were members of the Sahwa (Awakening) militia that was instrumental in turning the tide against Al-Qaeda.
In another attack on Monday, a police major general was wounded and his driver killed by a roadside bomb that targeted their convoy in eastern Baghdad, the official said. The officer's bodyguard and a passerby were wounded.
The officer is the head of the interior ministry's criminal evidence department.
The Sahwa, also known as the Sons of Iraq, were recruited by the US military among Sunni Arab tribesmen and former insurgents and played a key role in curbing violence that claimed thousands of lives in 2006 and 2007.
Dozens of Sahwa fighters have been killed in acts of retaliation in past months.